When a series of backyard pool homicides are reported in California, the BAU team searches for an UnSub with a puzzling past.
The team reopen the 1999 case of a high school debate champion whose death was originally ruled as a suicide.
Catherine and Nick investigate the deaths of two women who underwent the same unorthodox anti-ageing procedure. An apparent case of accidental poisoning turns out to be more than meets the eye.
Sipowicz meets Clark at the scene of a homicide and tells him that his meeting with Frank gave him no useful information that would help in his and McDowell's defence for Michelle's custody.
Connie prepares for the hearing that will let her obtain custodial rights to Michelle. She mentions that the question of home status came, and that being not being married may be an issue.